package com.times.core.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @author 许志远
 * Spring的Context工具类
 */
@Component
public class ApplicationContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext; // Spring应用上下文环境

    /*
     * 实现了ApplicationContextAware接口，必须实现该方法；
     * 通过传递applicationContext参数初始化成员变量applicationContext
     */
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        ApplicationContextUtil.applicationContext = applicationContext;
    }
    
    /**
     * 获取ApplicationContext对象
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    
    /**
     * 根据类名称（String）获取bean对象
     * @param name
     * @return
     * @throws BeansException
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) throws BeansException {
        return (T) applicationContext.getBean(name);
    }
    
    /**
     * 根据Class类型获取bean对象
     * @param name
     * @return
     * @throws BeansException
     */
    public static <T> T getBean(Class<T> name) throws BeansException {
        return (T) applicationContext.getBean(name);
    }
}